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mixing oil weights?

Das Motorad

Hey, a fellow rider mixed his oil weights in his soft tail, I was wonder if anyone ? GLIDER :) could tell me what this can cause in the long run? I was wondering what the oils did when mixed? one was 10/40 the other 20/50 do the oils seperate due to the weights?
It's not a bad thing to do but with different additives in the different oils there may be something that doesn't play together very well. I would stick with the same brand/ weight if there is a choice.

I wouldn't loose any sleep over it.